Periodicity and decay of craters over the past 600 MYR

Details Periodicity and decay of craters over the past 600 MYR Periodicity and decay of craters over the past 600 MYR

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992em%26p...58...57y&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 58, no. 1, p. 57-63.

Physics

9

Cratering, Decay Rates, Earth Surface, Planetary Craters, Secular Variations, Asteroids, Comets

Scientific paper

The data set of Grieve (1987) which provides diameters and ages of craters is analyzed to obtain periodicity of the formation rate and decay constant of craters. It is confirmed that large craters (D not less than 10 km) do not exhibit any periodicity while small ones appear to satisfy the Broadbent (1955, 1956) criterion for quantum (periodicity) hypothesis at P about 29.5 myr. The result is consistent with a recent study of Bailey (1991) who showed that large craters are largely due to asteroids. Allowing for the decay of craters, an excess of four small craters within the nearest past is detected. In this sense, one may argue that the solar system is now in a moderate comet shower.

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